Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f46350d39b470c7…

MALICIOUS

PDF

44.3 KB Created: 2020-08-30 12:50:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dbe0772bd8879d972d7bdac70e95b7d1 SHA-1: 76f1b9913e4a3da136752436197b106209045fe6 SHA-256: 7f46350d39b470c74c86972285e66144c300c95d1027ab60e079ce9d4d01deeb
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF file contains a significant number of embedded URLs, many of which point to a link farm. One critical heuristic identified a link to known malicious redirector infrastructure at 'https://ttraff.ru/wix?keyword=digimon+world+next+order+evolve+guide'. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains references to URLs and application names, further supporting the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.ru/wix?keyword=digimon+world+next+order+evolve+guide
    • https://static.usrfiles.com/ugd/edb4a7_9cffa39f152b48e4bb049f7849f87712.pdf
    • https://static.usrfiles.com/ugd/b8c837_9d3e9abb2b6948a4a38ce6d4ba5f8abb.pdf
    • https://static.usrfiles.com/ugd/b8c837_52cc22bbb8c04c398fb28627c88c81bb.pdf
    • https://static.usrfiles.com/ugd/3ce946_967a22748a5a41d9bcb73343176b1e24.pdf
    • https://static.usrfiles.com/ugd/9c43ec_63a22375d0fd4cb3952322362d45d0c4.pdf
    • https://cdn.shopify.com/s/files/1/0431/4903/3627/files/sort_worksheets_in_excel_vba.pdf
    • https://cdn.shopify.com/s/files/1/0450/6324/1891/files/12745032442.pdf
    • https://cdn.shopify.com/s/files/1/0429/3669/6999/files/clinkz_dota_2_guide_indonesia.pdf
    • https://cdn.shopify.com/s/files/1/0432/4163/5997/files/vudugemalefolavimimolu.pdf
    • https://cdn.shopify.com/s/files/1/0429/6205/9427/files/economy_minecraft_servers.pdf
    • https://cdn.shopify.com/s/files/1/0433/6166/5192/files/tavisirivemudopuxeludanux.pdf
    • https://cdn.shopify.com/s/files/1/0430/7373/2768/files/i_love_money_3.pdf
    • https://cdn.shopify.com/s/files/1/0436/1771/4334/files/darksoul_coc_server.pdf
    • https://cdn.shopify.com/s/files/1/0457/6624/6564/files/tanoxegilo.pdf
    • https://static.usrfiles.com/ugd/1b8612_96b744d5b5a247e98c136a52b4570bb5.pdf
    • https://static.usrfiles.com/ugd/8cbfce_a66f63e84dd7469ea9468dd5886ca48a.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006fca.bin
6c1eb710e5985f9fe04614aa6856ebd20b1f04d67ac719e198e2fc6b0bde2e09
pdf-font-stream PDF embedded font (sfnt) at offset 0x6FCA 4976 bytes
font_01_sfnt_off000080c0.bin
f1f63c6e72c8c4e20821f91fa9f16612a395e561056e84868edad72441eaf547
pdf-font-stream PDF embedded font (sfnt) at offset 0x80C0 10396 bytes